Cable construction.



E. mvv. CABLE ONSTRUCTION. vMPUCATION FILED NOV. |71 |916 192539,41 Q Patented Sept. 4, 1917.

UNITED snags PATENT oEEIoE,

ERNEST B. IIIVY,v OF RICHMOND, VIRGINIA, ASSIGNOR TO WORTENDYKE MNITFAC- TUBING CO., OF RICHMOND, VIRGINIA, A CORPORATION OF VIRGINIA..

CABLE CONSTRUCTION.

Specification of Letters Patent.'

V Application led November 17, 1916. Serial No. 131,927.

'following to be a full, clear, andeXact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention pertains to cable structure,

and more particularly to sheathed electric conductors.

In the manufacture of electric conducting cables a suitable number of individual strand conductors or stranded cables are arranged in suitable relation one upon the other, the conductors or the strands beinginsulated in one way or other and with different material, and these conductors are further incaseol in a sheathing of suitable material between the interior of which ,and the irregular surface of the interior strands or cables or conductors there is .provided usually a filling. The nature of this filling frequently varies not only in the characteristie-of its material but also in the manner in whichr it is placed upon the central cables to envelop the saine and closely fill the longitudinal interstices and the cavity within the sheath.

It is an object of the present invention to provide for the filling of these cables by the use of a material which is strong and durable, practically weather and waterproof, and is a good dielectric. l

Various materials have been used as a filling for embodying the central cable or conductor members within the sheath, and numerous objections are raised to different materials, for instance, when jute is used it is difficult to get a good solid filling, the nature of the fibrous substance not lending toward the complete filling of the narrow crevices along the strands or cables andwhere they overlap and contact with each other, and, moreover, material 0f the nainterstices along the twisted cables. To overcome these objections the present invention resides in employing a filler which consists of a number of cords or strands of paper substance which have a central body or core of fibrous material such, for instance, as twisted cotton, jute, or the like, about which the paper 1s twisted. This type of filler is stronger than filler which is composed entirely of paper and is stronger than when composed entirely of jute or other similar fibrous body, and minimizes the danger to the structure from rains o other natural elements.

lVith the above and other objects in view, as will be readily apparent to those skilled in the art, the present invention consists of a cable 'structure embodying a sheath within which is arranged a plurality of strands or cables of electricconductors, anda filling material enveloping the conductors and which is adapted to thoroughly fill the interstices about thecables or conductors and `form a substantial and weather-proof body filling within the sheath.

In the drawing: Figure 1 is a perspective View of a portion of the improved cable structure, and

Fig. 2 is a perspective view of a portion of the corded filler with its central cord or thread reinforcement.

lt is understood that in the illustration the exterior or sheath 2 of the cable may be of any suitable material and size as will be determined by the conditions to which its use will subject it, and that within the sheath Q theremay be enveloped a suitable number of wires ror conductors 3 which may. if desired, be arranged in the form of twisted strands l, and these latter suitably insulated exteriorly as by a coating or jacket of ,insulating material 5.,

Patented sepaa, 1917.

l'n order to give the desired rigidity to the cable structure and to centralize the cable strands 4c within the jacket or sheath 2, it

' is common to fill the cavity existent between the conductors and the interior surface of the vsheath 2 with a suitable filler having the desired properties of 'rendering' the interior of the tube substantially damp proofand which will give tensile strength to the structure.

ln this embodiment of the invention the filler 6 is shown as composed of a plurality of longitudinally arranged twisted or corded pieces as 7. The cord 7 preferably has anl exterior body structure of paper or other similar material as at 8 which is twisted upon a central core 9. This core preferably is of a fibrous stock or material twisted into a thread of the desired size to give the necessary or requisite strength according to the conditions in which the cable will be used.

As many'of the corded paper strips 7 will be wrapped longitudinally upon the insulated cables 4 as may be requisite, these' filler strands 7 being compressed firmly upon the central body or cables to enter the interstices along and between these cables as they are arranged, and preferably the exterior surface of the filler as indicated at 6, Fig. l, will assume a suitably circular cross sectional form to approximately fit the interior surface of the sheath 2 when the latter is circular.

While in the embodiment shown in Fig. 1 of the drawing, three central cables are enveloped in the filling body 6 andthe latter is shown conventionally as comprised of three compressed corded paper strands Swith their central threads 9, it is to be understood that the number of the cables and the number of the paper filling strands 7 with their cores may be readily varied and laid as best adapted for the purpose in hand.

The central threaded strand of jute, cotton, or other fibrous material may be wrapped with this exterior paper coating, the latter being applied to secure the desired size of strand, and these are then twisted `or otherwise laid longitudinally upon the central core to secure the filling or body 6. This combination of a corded filler such as 7 embodying paper cord and having a fibrous central core results in giving the necessary strength to the filler, thel reinforced paper cord being stronger than in the case where the fibrous core 9 is not utilized, and an advantage in the use of the paper body 1s that it readily fills the interstices in a manner much more efficient than where jute or other fibrous material alone is utilized.

Therefore, the present invention embodies the process for the manufacture of a cable structure in which central cables 4 are arranged in longitudinal bearing one upon another and enveloped by a series of paper strands having a fibrous twisted core.

What is claimed as new is: 4

1. A sheathed cable structure having central grouped, insulated conductors or wires enveloped in a filling consisting of corded paper each cord having a fibrous, strengthening thread.

2. A sheathed cable structure having conducting insulated strands or wires enveloped in a filling consisting of paper cords each twisted upon a fibrous, strengthening thread.

3. A cable structure having grouped conducting insulated strands lor wires enveloped in a filling consisting of corded paper having twisted, fibrous, strengthening threads, and a sheath compressing the filling closely about the conductors.

4. A filler for sheathed conductors consisting of corded paper each cord having a fibrous reinforcing thread.

5. A filler for sheathed conductors consisting of cords of paper strips each cord having a fibrous reinforcing thread.

In testimony whereof I affix my signature in presence of two witnesses.

ERNEST B. LTVY. Witnesses S. D. WALDEN, O. SHELTON 

